Water trap damage evaluation instrument for high temperature and high pressure tight gas reservoirs

Abstract

The invention discloses an evaluation instrument for the damage of aqueous phase trapping of a high-temperature high-pressure tight gas reservoir. The evaluation instrument comprises a rock-core holder system, a liquid displacement system, a gas displacement system, a gas-liquid metering system and a data acquisition system, wherein the rock-core holder system comprises a rock-core holder 3, a confining pressure pump 4, a confining pressure sensor 14 and a temperature-rising / temperature-controlling device 21; the liquid displacement system comprises a liquid storage tank 12, a liquid metering pump 11 and a liquid displacement pressure sensor 18; the gas displacement system comprises a gas cylinder 1, an inlet pressure stabilizing tank 2, a pressure returning device 6 and a pressure returning stabilizing tank 10; the gas-liquid metering system comprises a gas-liquid separator 7, an electronic scale 8 and a gas flow meter 9; and the temperature-rising / temperature-controlling device 21 and the confining pressure sensor 14 and the like are connected with a computer 13 to form the data acquisition system. The evaluation instrument disclosed by the invention has the advantages that the automation degree is high, the function is complete, the damage process of the aqueous phase trapping of the tight gas reservoir under the operation links such as drilling, completion, workover and yield increase can be simulated, and the damage degree of the aqueous phase trapping can be evaluated.

Description

technical field [0001] The invention relates to experimental equipment for evaluating indoor high-temperature, high-pressure tight gas reservoir water-phase trap damage in the petroleum and natural gas industry. The equipment can simulate the working fluid intrusion in the downhole high-temperature and high-pressure over-balanced / near-balanced / under-balanced operation links and the development and production process. Water phase fluid flowback provides experimental basis for water phase trap damage evaluation and working fluid optimization of tight gas reservoirs, and belongs to the experimental equipment for gas layer protection in the process of oil and natural gas exploration and development. Background technique [0002] During operations such as drilling, completion, and stimulation, water-based working fluid invades the reservoir through filtration or self-imbibition, causing water-phase trap damage, such as the development of sensitive clay minerals, which can also ind...

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Problems solved by technology

[0003] At present, the relative permeability measurement under normal temperature and pressure is mostly used to evaluate the damage potential of water phase traps, but the relative permeability test method is still not applicable to tight cores, or the water phase flowback rate under certain conditions is used to evaluate water phase trap damage, which has not yet been formed. An evaluation instrument capable of simulating the damage process of water phase traps under a high temperature and high pressure environment and a certain operating pressure difference

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